Water-tube boiler.



No. 634,303. Patented Oct. 3, I899. J. M. MAXWELL.

WATER TUBE BOILER.

(Application filed May 12, 1899.) (No Model.)

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No. 634,303. Patented Oct. 3, I899.- J. M. MAXWELL. WATER TUBE BOILER.

(Application filed m 12, 1899 2 Sheets-Sheet 2,

( No Model.)

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JAMES M. MAXIVELL, OF PITTSBURG, PENNSYLVANIA.

WATER-TU BE BOILER.

SPECIFICATION formingpart of Letters Patent No. 634,303, dated October 3, 1899.

Application filed May 12, 1899. Serial No. 716,487. (N0 model.)

To all whom iv may concern:

Be it known that 1, JAMES M. MAXWELL, a citizen of the United States of America, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certa in new and useful Improvements in ater-Tube Boilers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and usefulimprovements in boilers, and more particularly to that class known as tubular boilers.

The herein-described invention is particularly designed and adapted to beeinployed in conneetion with boilers wherein the tubes are placed in an upright position.

The invention has for its object the provision of novel means whereby an equal distribution of heat is obtained. Furthermore, the invention aims to construct a boiler wherein a large heating-surface is obtained.

Another object of my invention resides in the construction of the grate-bars to obtain a practically smokeless furnace, if properly fired.

A still further object of the invention is to construct the boiler in such a manner as to prevent the tubes burning out.

Vith the above and other objects in view the invention finally consists in the novel construction, combination, and arrangement of parts to be hereinafter more particularly described, and specifically pointed out in the claim.

In describing the invention in detail reference is had to the accompanying drawings, forming a part of this specification, and wherein like numerals of reference indicate corresponding parts throughout the several views, in which a Figure 1 is a vertical sectional view of my improved boiler. Fig. 2 is a horizontal sectional view taken on the line 2 2 of Fig. 1. Fig. 3 is a similar view taken on the line 3 3 of Fig. 1.

Referring to the drawings by referencenumerals, 1 indicates the shell of the boiler, which is cylindrical in form. 2 represents the inner casing, this easing being inwardly inclined at an angle, forming a deflector 3, extending circumferentially of said casing.

. Between the outer shell and inner casing is formed a water-jacket 4. In the upper portion of the shell 1 is provided a steam-dome 5, having a bottom' 6, in which are formed openings 7, adapted to receive the watertubes 8, the latter extending downwardly through the bottom 9 of the combustion-chamber 10 and communicating with the waterjacket 4. The said water-tubes are set at an angle and are inclined inwardly toward the center of the boiler.

The reference -numeral 11 indicates the grate-bars, and 12 the supplemental gratebars.

The reference-numeral13 indicates the firebox, the latter communicating with the combustion-chamber 10.

Near the upper extremity of the casing 2 are arranged horizontal flues 14, leading to the vertical flue 15, which is formed of a hood 16, surrounding the steam-do1ne 5, said hood carrying a flange 17, this flange serving to secure the hood to the shell, said hood communicating with the smoke-stack.

The reference-numeral 18 indicates manholes arranged in the lower part of the shell for the purpose of removing any sediment that may form in the bottom of the waterjacket, and tubes 20 are arranged horizontally and extend through the shell and inner casing, forming manholes.

The reference-numeral 21 indicates a ventilator or fan arranged below the grate-bars 11.

The operation of myimproved tubular boiler is as follows: The green coal is placed on the grate-bars 12. When the fire has reached the proper state, the live coals are transferred to the grate-bars 11. The flames will then be forced by the ventilator through the firebox into the combustion-chamber and between the tubes 8 through the horizontal flues l4, thence to the flue 15, to the stack. Particular attention is directed to the deflector 13, this deflector serving a double purposenalnely, arresting the flames in a direct upward draft, deflecting the same against the tubes, and causing a uniform distribution of the heat throughout the combustionchamber, and, secondly, providing a greater heating-surface, than could otherwise be obtained.

Another marked advantage obtained by the use of my improved tubular boiler is the superheating that takes place in the steam-dome by reason of the construction and arrangement of the horizontal lines 1-1 and fine 15.

I am aware of the fact that prior to my in vention tubular boilers have been constructed the water-tubes of which are set at an angle and inclined toward the center of the boiler. I-therefore do not claim this particular construction broadly; but

hat I do claim as new, and desire to secure by Letters Patent, is

In a tubular boiler, the combination of a combustion-chamber suit-ably connected to a fire-box, an outer shell, an inner casing suitably spaced from and surrounded by said outer shell forming awater-jacket, a series of vertical tubes arranged in said combustion-chan'lber inclining toward the center thereof, a steam-dome, a hood surrounding 20 the said dome provided with a suitable outlet, horizontal flues arranged at the upper portion of the combustion-chamber for connecting the same to the hood, and an inwardly-projecting deflector extending circum- 25 ferentially in the combustion-chamber and formed integral with the said casing, substantially as set forth. 

